diff --git a/main/ui/src/main/resources/css/dark_theme.css b/main/ui/src/main/resources/css/dark_theme.css
index 3c078e36d..6e9ccdd3b 100644
--- a/main/ui/src/main/resources/css/dark_theme.css
+++ b/main/ui/src/main/resources/css/dark_theme.css
@@ -14,6 +14,8 @@
 	CONTROL_BORDER_FOCUSED: #9E9E9E;
 	CONTROL_BG_NORMAL: #222;
 	CONTROL_BG_ARMED: #515151;
+	CONTROL_PRIMARY_BG_NORMAL: #598016;
+	CONTROL_PRIMARY_BG_ARMED: #70A11B;
 	CONTROL_WHITE_BG_ARMED: #E1E1E1;
 	SCROLL_BAR_THUMB_NORMAL: #626262;
 	SCROLL_BAR_THUMB_HOVER: #7E7E7E;
@@ -291,6 +293,19 @@
 	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_BG_ARMED;
 }
 
+.button:default {
+	-fx-text-fill: white;
+	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_PRIMARY_BG_NORMAL;
+}
+
+.button:default:focused {
+	-fx-background-color: CONTROL_BORDER_FOCUSED, CONTROL_PRIMARY_BG_NORMAL;
+}
+
+.button:default:armed {
+	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_PRIMARY_BG_ARMED;
+}
+
 /*******************************************************************************
  *                                                                             *
  * Checkbox                                                                    *
diff --git a/main/ui/src/main/resources/css/light_theme.css b/main/ui/src/main/resources/css/light_theme.css
index 55d0d7109..8b120fa22 100644
--- a/main/ui/src/main/resources/css/light_theme.css
+++ b/main/ui/src/main/resources/css/light_theme.css
@@ -14,6 +14,8 @@
 	CONTROL_BORDER_FOCUSED: #9E9E9E;
 	CONTROL_BG_NORMAL: #FFF;
 	CONTROL_BG_ARMED: #E1E1E1;
+	CONTROL_PRIMARY_BG_NORMAL: #70A11B;
+	CONTROL_PRIMARY_BG_ARMED: #598016;
 	CONTROL_WHITE_BG_ARMED: #E1E1E1;
 	SCROLL_BAR_THUMB_NORMAL: #CFCFCF;
 	SCROLL_BAR_THUMB_HOVER: #B1B1B1;
@@ -291,6 +293,19 @@
 	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_BG_ARMED;
 }
 
+.button:default {
+	-fx-text-fill: white;
+	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_PRIMARY_BG_NORMAL;
+}
+
+.button:default:focused {
+	-fx-background-color: CONTROL_BORDER_FOCUSED, CONTROL_PRIMARY_BG_NORMAL;
+}
+
+.button:default:armed {
+	-fx-background-color: CONTROL_BORDER_NORMAL, CONTROL_PRIMARY_BG_ARMED;
+}
+
 /*******************************************************************************
  *                                                                             *
  * Checkbox                                                                    *